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Solid potassium ferrate preparing method

A kind of potassium ferrate and solid technology, applied in electrolysis process, electrolysis components, etc., can solve the problems of increased process, lower ferrate yield, low purity and current efficiency, etc., easy to achieve process parameters, high space-time efficiency, and production process little effect

Inactive Publication Date: 2004-04-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the number of procedures and reduces the yield of ferrate, but more seriously produces a large amount of KOH and NaOH mixed alkali solution, and this mixed alkali solution cannot be recycled for NaOH 2 FeO 4 The preparation stage of the solution, otherwise the utilization rate of hypochlorite or electric current will be reduced
In order to overcome this situation, a recently reported method using KOH, NaOH mixed alkali solution as the anolyte to electrolyze the iron anode to directly prepare solid K 2 FeO 4 method (Electrochemistry.Communication, 4, 2002, 764-766), but on the one hand, this article does not disclose detailed process parameters, on the other hand, the prepared solid K 2 FeO 4 The purity and current efficiency of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use a PVC square diaphragm electrolyzer, the volume of the anode chamber is 10×10×5cm 3 , the volume of the cathode chamber is 10×10×2cm 3 , the diaphragm is an effective area of ​​7 × 12cm 2 perfluorinated cationic membrane. The anode is 32 layers with an effective apparent area of ​​40cm 2 30 mesh ordinary braided iron mesh (wire diameter d = 0.14mm), the effective apparent area of ​​the cathode is 40cm 2 nickel foam. The anolyte volume is 200ml, and the catholyte volume is 100ml. Both anolyte and catholyte are 13M KOH solution. Add 2.5ml additive solution to the anolyte, CuCl in the additive solution 2 、KIO 3 、Na 2 SiO 3 The concentrations of , KI, and KOH are 0.015M, 0.015M, 0.3M, 0.015M, and 5M, respectively. The electrolytic cell was placed in a constant temperature water bath with an initial temperature of 60°C, and the temperature stabilized at 65°C after the current was applied for about half an hour. Vigorously stir the anolyte with an electric stir...

Embodiment 2

[0037] The K obtained by the method described in Example 1 with a purity of 95% 2 FeO 4 20 g of the solid was dissolved in 200 ml of 7M NaOH solution under ice-bath conditions. After vacuum filtration through a sand core funnel, the concentration of ferrate in the filtrate was determined to be 0.47M by the chromate method. Under the condition of ice bath, 20mL of filtrate and 10mL of saturated KOH were successively mixed in the same suction filter bottle through a sand core funnel, and reacted for 2 to 3min to make a mixture containing solid K 2 FeO 4 Seed mother liquor. Under the condition of magnetic stirring, add the remaining 180mL filtrate and 90mL saturated KOH solution alternately into the suction filtration flask at the speed of 5-8mL / min and 2.5-4mL / min respectively, keep the solution temperature below 20°C, and the whole feeding process is at 20°C. Complete within ~30min, then continue to stir for 5min. The K obtained from the reaction in the suction filter flask...

Embodiment 3

[0039] Use a PVC square diaphragm electrolyzer, the volume of the anode chamber is 10×10×5cm 3 , the volume of the cathode chamber is 10×10×2cm 3 . The diaphragm is an effective area of ​​7 x 12cm 2 perfluorinated anion membrane. The anode is 32 layers with an effective apparent area of ​​40cm 2 30 mesh ordinary braided iron mesh (wire diameter d = 0.14mm), the effective apparent area of ​​the cathode is 40cm 2 nickel foam. The anolyte volume is 200ml, and the catholyte volume is 100ml. Both anolyte and catholyte are 13M KOH solution. Add 2.5ml additive solution to the anolyte, CuCl in the additive solution 2 、KIO 3 、Na 2 SiO 3 The concentrations of , KI, and KOH are 0.015M, 0.015M, 0.3M, 0.015M, and 5M, respectively. The electrolytic cell is placed in a constant temperature water bath, the initial temperature is 60°C, and the temperature stabilizes at 66°C after the current is applied for about half an hour. Vigorously stir the anolyte with an electric stirrer, el...

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Abstract

The present invention provides a method having no need of any chemical oxidant to prepare solid K2FeO4. It is characterized by that using diaphragm-type electrolytic bath and using DC to make electrolysis in the KOH solution containing stabilizer, and make the electrode containing iron material undergo the process of anodic oxidation to directly obtain the invented solid K2FeO4 whose purity is greater than 90 wt% by means of one step. Said solid K2FeO4 is applicable to make treatment agent for sewage or drinking water and oxidant for organic synthesis. After having been purified it also can be used as positive active substance of alkaline perferrate cell.

Description

Technical field [0001] The invention belongs to the preparation technology of ferrate, be specifically related to solid potassium ferrate (K 2 FeO 4 ) preparation method. Background technique [0002] Ferrate, which has strong oxidizing properties, has attracted more and more attention because of its unique environment-friendly characteristics. As a treatment agent for sewage and drinking water, it does not have the "three hazards" of chlorine-containing disinfectants; as an organic synthesis oxidant, it does not have secondary pollution caused by permanganate or dichromate reduction products; as an alkaline battery positive electrode The active material not only has the advantages of environmental friendliness and abundant resources, but also has high voltage and large capacity. However, there is currently no preparation process suitable for industrial production in terms of economy, scale, and product form, which slows down the application of ferrate in various fields. ...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B1/14
Inventor 杨长春高杰
Owner ZHENGZHOU UNIV
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